.cover {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.3);
    z-index: 99999;
}

.float_wnd {
    position: fixed;
    top: 50%;
    left: 50%;
    width: 550px;
    background: #FFF;
    transform: translate(-50%, -50%);
    border-radius: 40px;
    padding: 50px 40px;
}

.show {
    opacity: 0;
}